《Tetrabiblos》Signs InconjunctClaudius Ptolemy（Ashmand 英譯 1822）
And what those figures are before said to perform” (that is, to take up a semicircle) “either doubled or joined together, may also be truly ascribed unto the opposite aspect by itself; for that the diametral line, which passeth from the place of conjunction to the opposite point, divideth a circle into two equal parts: the like whereof cannot be found in any other inscripts; for example, the _side of a regular pentagon_” (the quintile) “_subtendeth 72 degrees, of an octagon_” (the semiquadrate) “_but 45; the remainders of which arcs, viz.
段落 tetra-1-signsincon-10public-domain (Ashmand 1822)
↗ 開啟公有領域原文（Wikisource）此段為公有領域典籍逐字擷取，零 AI 生成；原文亦存繁化前底本，可逐字審計。我們寧可少引、不可錯引——驗不過的引文一律捨棄。